Cat Allergic to mosquitos, alternative meds?

Hello all! We have a orange shaggy rug of a cat who is allergic to mosquitoes. When first finding this out, the vet gave him a shot and explained that he would scab up on his nose since that is the only place for him to have a reaction and it scabs up way bad! The shot they gave him cost about $120 (some kind of steroid). So my question would be: is there something else that could work to alleviate the guy's discomfort? A vet trip every month can add up in costs. We do keep him indoors for all the hot months when the mosquitoes are out. This seems to help him out but we loose sleep due to him being vocal in the middle of the night. Some times he ninjas out the door which means he will get another reaction(looks like road rash on the top of his nose).

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